I am really surprised that no one mentioned the sequencer. I am not a pro player, mostly play for my own enjoyment. Occasionally I will play out for some party or a get together but they are really far and few between. I want a arranger with a good sequencer. I play songs for me in my age era. These would be songs from the late fifties and early sixties. The doo wop era. Back in the time they introduced symphony strings and back up singers in. I like to have the songs I play as close to the originals as I can get them. I sequence the strings, horns etc coming in the song at different times. I am not a singer so I play the lead and let the strings and etc come in. The only problem is you have to know where you are at at all times. As you can see my era means I am 75 years old but I do love the arrangers.
RC